Introduce the M_ZERO flag to malloc(9)

Instead of:

        foo = malloc(sizeof(foo), M_WAIT);
        bzero(foo, sizeof(foo));

You can now (and please do) use:

        foo = malloc(sizeof(foo), M_WAIT | M_ZERO);

In the future this will enable us to do idle-time pre-zeroing of
malloc-space.

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/kern/kern_malloc.c b/sys/kern/kern_malloc.c
index a2e77fd..f268be6 100644
--- a/sys/kern/kern_malloc.c
+++ b/sys/kern/kern_malloc.c
@@ -280,6 +280,9 @@ out:
 		ksp->ks_maxused = ksp->ks_memuse;
 	splx(s);
 	mtx_exit(&malloc_mtx, MTX_DEF);
+	/* XXX: Do idle pre-zeroing.  */
+	if (va != NULL && (flags & M_ZERO))
+		bzero(va, size);
 	return ((void *) va);
 }